cmake_minimum_required(VERSION 3.8)
project(hello_qt)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

# find dependencies
find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
# 重点1：引入Qt库
find_package(Qt5 REQUIRED COMPONENTS Widgets)

add_executable(hello_qt_exec src/main.cpp)
# 重点2：链接Qt库
# 这里为什么使用target_link_libraries而不是ament_target_dependencies？
# 因为Qt5这个库并不是ros的功能包库，而ament_target_dependencies是用于快速查找和依赖ros功能包的工具。
target_link_libraries(hello_qt_exec Qt5::Widgets)

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  # the following line skips the linter which checks for copyrights
  # comment the line when a copyright and license is added to all source files
  set(ament_cmake_copyright_FOUND TRUE)
  # the following line skips cpplint (only works in a git repo)
  # comment the line when this package is in a git repo and when
  # a copyright and license is added to all source files
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

install(TARGETS hello_qt_exec
  DESTINATION lib/${PROJECT_NAME})

ament_package()
